Island



(No Model.) i

' H. O. LUTHER.

Machinery for Automatically Delivering Sand to Grinding Wheels.

No. 237,563. Patented Feb. 8,188!- e -i i i NAFETERS.PHOIO-LITHOGRAPHER. WASHINGTON. D. C-

UNITED STATES PATENT OFFICE.

HENRY O. LUTHER, OF PROVIDENCE, RHODE ISLAND.

MACHINERY FOR AUTOMATICALLY DELIVERING SAND T0 GRINDING-WHEELS.

SPECIFICATION forming part of Letters Patent No. 237,563, dated February8, 1881. Application filed December 20, 1880. (No model.)

I To all whom it may concern: 7 f

Be it known that 1, BEN}? O. LUTHER, of Providence, in the State of Bode Island, have invented an Improvement in Tachinery forAutomaticallyDeliveringSand rEmerytoGrinding-Wheels, of which the lowingis a specifioation.

My invention relates to" suitable means for feeding the sand or emery tolap-wheels or grinding-surfaces automatically; and it consists in a diskof suit le diameter, made to revolve in a receptacle of sand or emerymixed with water or other material to form a paste, in combination withscraper and conductingtrough for removim the grinding-paste from thesurface of t revolving disk and conducting it, in proper quantity, tothe grindingsurface.

My improvement is applicable to all grinding-machines where loose sandor emery is used as the cutting substance, and has to be constantlysupplied to the work, thus render ing such grinding-machines, in somecases, entirely automatic, where at present a workman is employed; andit is also adapted to lapidarys work, where heretofore the workman hasbeen required to feed the emery to the wheel with one hand, as occasionmight require, while he also held the work upon the wheel with theother. Thus the care and skill required to produce first class work weregreatly increased.

In the accompanying drawing, A represents a lapidarys bench surroundedby the elevated sides B B, and'provided on the front side with thenotches b. b, for the arms of the operator.

0 is the horizontal lap-wheel secured to the upright shalt D, which isdriven by means of the pulley soon the shaft D, the pulley 13 upon theshaft L, and the band G.

The revolving disk H is made of sufficient diameter to extend to nearthe bottom of the well I, and is secured to a horizontal shaft which isheld in a journal, J, attached to the back of the bench, and is providedat its outer end with a pulley, K, driven by the band it, which passesaround the shaft L, as shown by the dotted lines.

The trough M for delivering the emery paste to the lap-wheel G ispivoted to the cross-bar N at the point a, and is provided at its upperend with an inclined scraper, O, for scraping the emery paste from theface of the disk H, so that it may flow through the trough M to thelap-wheel in proper quantity, the pivot n being placed at one side ofthe trough so that by slightly swinging the end of the trough which isabove the lap-wheel either to the "right or left, as the case may be, agreater or less quantity of emery will flow to the lapwheel.

The sides and bottomof the well I are beveled, in order to throw theemery t0 the deepest part in close proximity to the revolving disk H.The bench P is inclined toward the well I, so that the emery paste afterleaving the lap-wheel may flow directly into the well, to

be again raised by the revolution of the disk.

I claim as my invention- In a grinding or polishing machine, thecombination of a receptacle for the cutting material with a revolvingdisk having its lower edge embedded in the cutting material, with ascraping-edge at the side of the upper portion of the disk, and-a troughfor conveying the material removed from the disk to the grinding-surfaceby gravity, substantially as described.

HENRY O. LUTHER.

Witnesses:

JOSEPH J. SGHOLFIELD, SooRATEs SoHoLFrELn.

